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It isn`t the jets. How about the valve springs? Try testing them for pressure.... may be float city... which could also cuase a backfire.
like someone mentioned....are you sure the secondaries are fully opening?
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The engine was completely gone through shortly before I bought the car. I do realize that it is difficult to judge the quality of someone's work when the engine is buttoned up, but I find it difficult to believe that the valve springs could be an issue with less than 10,000 miles on them.
However, I have learned to never say never.
How would I go about testing the secondaries on a vacuum secondary Holley?
Just for the record, the people on this site have provided some great advice so far.
